Device for reducing pressure in water or gas pipes



(No Model.)

0. DELAFIELD.

DEVICE FOR REDUCING PRESSURE IN WATER 0R GAS PIPES.

No. 393,501. Patented Nov. 27; 1888.

l vitweowo Elm manic z UZarenceJeZfiz'e Li,

C? QHPOLMidO UNITED STATES PATENT OFFICE.

CLARENCE DELAFIELD, OF MOBILE, ALABAMA.

DEVlCE FOR REDUClNG PRESSURE IN WATER OR GAS PIPES.

SPECIFICATION forming part of Letters Patent No. 393,501, dated November 27. 1888.

Serial No. 273.613. (No model.)

' in Wat-er or Gas Pipes, of which the following is a specification.

My invention relates to an improvement in devices for reducing the pressure in water or gas pipes without altering the pressure of the water or gas in the mains; and it consists in the peculiar construction and combination of devices that will be more fully set forth hereinafter, and particularly pointed out in the claim.

In the accompanying drawings, Figure l is a vertical longitudinal central sectional view of a pressure-reducing apparatus embodying my improvements. Fig. 2 is a vertical trans verse sectional view of the same, taken on the line 00 ac, of Fig. 1.

C represents an inlet'pipe, which communicates with the main (not shown) and extends into an inclosing-cylinder, F, the opposite end of which is closed by a head or plate, from which projects an outlet-pipe, D, that is of the same diameter as the pipe C. The inner end of the latter is interiorly screw-threaded.

A represents an annular piston, which fits snugly in the cylinder F, and has a central opening, through which the inlet-tube C extends, the said piston being adapted to move backward and forward in the cylinder.

B represents a valve, which is made of rubber or other suitable elastic material, is semispherical in shape, and has its convex side presented toward the inner end of the inletpipe 0, the said valve being seen red to ayoke, E, which is in turn attached to and extended from the piston A.

In theinner end of theinlet-pipe C is screwed a removable collar or reducer, H, having a central opening ofany desired diameter. A number of these reducing-collars may be provided for the apparatus and interchangablyattached to the inlet-pipe, the said reducers having the central openings of varying diameter. The Valve B is adapted to impinge against the adjacent end of the reducing-collar, so as to close the inlet-pipe.

It is evident that the pressure on the annular piston A and the valve B will be proportionate to the surfaces exposed to pressure. The pressure on the valve B can be made more or less by making the orifice of the inlet-pipe C greater or larger by means of the reducingcollars hereinbefore described, and hence the difference in pressure will be in proportion to the surface of the annular piston to the exposed surface of the valve D as regulated by the reducer. I

If the annular surface of the piston is, say, 1, and the surface of the valve 0.25, then a pressure of eighty pounds on the inlet-pipe will be equaled by a pressure of twenty pounds persquareinch on the annular piston. Any desired pressure may be obtained in the outletpipe by varying the diameter of the opening in the reducing-pipe.

Having thus described my invention, I claim- The combination, with the cylinder F, the outlet-pipe D, the inlet-pipe C, passing into aligned openings in the valve and in the end of said cylinder, and the detachable collar H in the inner end of the pipe C, of the piston A, the yoke E, integral with the piston, and the hemispherical valve B, of a suitable elastic material secured centrally to the yoke in alignment with the inlet-pipe C and entering the adjacent orifice of the detachable collar H when said collar closes upon it, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

CLARENCE DELAFIELD.

W'itnesses:

A. J. GAVETT, NATHL. P. HOBART. 

